Arcadia's Labyrinth Hyakkin,百均

A boy named Alkain comes to the labyrinth city to become a successful adventurer but loses his life on his first day due to his immaturity. When he woke up again he was in a strange room. There he learns the truth. That the world he had lived in so far was an eroge, and he was the protagonist…
When he knew everything he decided to look for a walkthrough.
This is the story of a protagonist who acquired knowledge of the reality.